| Username | Title | Posts | Registration date |
|---|---|---|---|
| off-the-scale-racing | Rookie Driver | 2 | 2009-12-30 |
| offroadfun | Rookie Driver | 1 | 2021-01-04 |
| offroadr12 | Paddock Rat | 21 | 2016-03-14 |
| Offroadracer | Rookie Driver | 1 | 2020-07-22 |
| Ogers | Rookie Driver | 2 | 2011-03-07 |
| ogorshkov | Rookie Driver | 2 | 2016-02-03 |
| OH3Cobra | Rookie Driver | 2 | 2012-08-15 |
| ohaythair | Paddock Rat | 39 | 2010-06-07 |
| Ohioan | Rookie Driver | 0 | 2023-06-19 |
| ohiobimmer | Rookie Driver | 2 | 2012-02-17 |
| OhioMark | Ripened Lemon | 170 | 2009-12-22 |
| ohms | Ripened Lemon | 202 | 2012-02-13 |
| ohryanhaha | Rookie Driver | 1 | 2022-01-03 |
| OhShitItsJimmy | Rookie Driver | 12 | 2020-03-30 |
| OhYeahDant | Rookie Driver | 11 | 2024-02-13 |
| oifish | Rookie Driver | 4 | 2015-10-13 |
| Oilburner | Rookie Driver | 0 | 2018-10-17 |
| OIRAM1970 | Rookie Driver | 4 | 2011-10-05 |
| ojannen | Rookie Driver | 3 | 2017-11-09 |
| OkayestHeelToer | Rookie Driver | 0 | 2022-11-28 |
| OKAYNYNJPA | Rookie Driver | 8 | 2015-05-25 |
| Okey3000 | Rookie Driver | 1 | 2020-02-14 |
| Ol'Red | Rookie Driver | 5 | 2018-04-05 |
| olaaf | Ripened Lemon | 368 | 2010-11-05 |
| OlCreFoo | Ripened Lemon | 169 | 2009-09-11 |
| Old Bones | Rookie Driver | 1 | 2016-03-04 |
| old trickster | Rookie Driver | 1 | 2013-01-27 |
| oldcpecdr | Rookie Driver | 2 | 2022-01-05 |
| oldFahrt | Rookie Driver | 1 | 2024-02-27 |
| OldFart | Ripened Lemon | 182 | 2009-06-29 |
| oldgrumpylemondude | Rookie Driver | 4 | 2023-08-21 |
| oldguy | Rookie Driver | 2 | 2015-05-04 |
| oldskoola1s | Rookie Driver | 1 | 2015-10-12 |
| OldskoolGP | Rookie Driver | 2 | 2016-03-22 |
| oldsmobile1915 | Rookie Driver | 2 | 2011-02-16 |
| olegace | Rookie Driver | 11 | 2011-02-14 |
| olifant | Rookie Driver | 3 | 2013-08-06 |
| olskuel | Rookie Driver | 2 | 2011-11-24 |
| OlympiaBinewski | Rookie Driver | 3 | 2010-08-11 |
| Omaryo | Rookie Driver | 1 | 2023-01-23 |
| OMB_Godfather | Rookie Driver | 19 | 2013-09-08 |
| omDax | Rookie Driver | 1 | 2012-01-09 |
| Omegas | Rookie Driver | 10 | 2017-12-04 |
| OMGuar | Ripened Lemon | 320 | 2010-09-01 |
| Omnilith | Effluent | 934 | 2009-11-24 |
| Omnivore | Rookie Driver | 3 | 2016-07-08 |
| onebadbug | Rookie Driver | 2 | 2012-09-13 |
| OneBuddy | Rookie Driver | 1 | 2016-05-25 |
| oneday | Ripened Lemon | 224 | 2009-05-01 |
| oneevilchicken | Rookie Driver | 0 | 2017-07-28 |